I presume this problem is related to Version 2.11 but this has not been confirmed.
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I first noticed this post on the Fast Dial AMO Page
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Nice
by Daniel Houriez on October 28, 2008
Nice addon, very useful.
For the many others who have their address bar screwed up, just removing the icon from the toolbar fixed this for me. You still have many other ways to access FD's options.
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So I then posted a Bug Report here
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Since then there has been a further post on this matter here
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To remove the Fast Dial Toolbar Icon please see
Fast Dial Toolbar Icon